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13x(-3)-7x(3)=0
We simplify the equation to the form, which is simple to understand
13x(-3)-7x(3)=0
Reorder the terms in parentheses
+(-39x)-7x*(3)=0
Remove unnecessary parentheses
-39x-7x+*(+3+)=0
Reorder the terms in parentheses
-39x+(-21x)=0
Remove unnecessary parentheses
-39x-21x=0
We move all terms containing x to the left and all other terms to the right.
-39x-21x=0
We simplify left and right side of the equation.
-60x=0
We divide both sides of the equation by -60 to get x.
x=-0
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